Quote:
Originally Posted by IndeedSS1
It is a pretty quiet system. Throw some HFC to headers on there and lets try the drone thing again. Are the resonators flow through pipes perforated or louvered and what kind of packing? I'll assume louvered and steel. 
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The Resonators are tuned to cancel drone, No packing or louvers visible.
They are straight through with windows that give the Bad Noise a Place to Hide.
Ted.